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Originally Posted by PeriscopeDepth
When using the FFG active sonar I've defintely had blind spots occuring at various ranges, bearing seems to have no effect though. And if you wait a few seconds later and ping again the blind spot will go away, or perhaps be in a different place. So what is this?
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That's something different. Noise levels, reverberation, target strength, etc. need not be constant over time. There is a certain degree of randomness in them, so on one ping you might get signal excess and the next ping get nothing. As you get closer, you should get more signal excess, so the other factors which compete to keep your signal submerged in the noise become less important. There's probably a better way to say that, but it's early still. :-)